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    How Much Light

    Hey growers, How much light would you guys recommend for two indoor plants in a 2x4 tent. I am finishing up my second grow right now. Since starting I have done two plants at a time with 150w hps per plant both veg and flower in 5 gal pots with good potting soil. I have noticed from my own research that most people seem to talk about watts per square foot of canopy for HID lights. Any thoughts?

    #2
    I run 424 watts in a 2x4 but 300 total watts from hps ahould be enough.

    Comment


      #3
      Rule of thumb for HID/blurple leds is 50w/ sq ft of coverage. If you run good leds(QB, cobs, light strips) then 30w/ sq ft will give you comparable light levels.
      WHAT???
      5x5 grow space
      800w of Vero's and F-strips
      4-17gal totes self-made UC system.

      Comment


      • TheGoodFarmer
        TheGoodFarmer commented
        Editing a comment
        Your talking about the sq ft of the canopy, not the whole tent right?

      #4
      Lux meters takes all the guessing away. You get to know exactly what’s going on and at different spots.

      Comment


      • Spidermite
        Spidermite commented
        Editing a comment
        They dont work with leds

      • TheGoodFarmer
        TheGoodFarmer commented
        Editing a comment
        I will look into that, What reading would you shoot for?

      • Spidermite
        Spidermite commented
        Editing a comment
        If you can find them read @Drphotons articles

      #5
      I've done a lot of reading and am about to set back up my 2x4x4 tent again to veg in, I bought a 300 Watt Cobb light for the veg tent. That is more than enough for that space.
      Flower Tent: (12/12)
      600W HPS Flowering
      1 x Jack Herer 2 Auto - Potters Gold Soil
      1 x Gelato - Coco
      2 x Strawberry Banana - Coco

      Veg Room: (14/8)
      1500W LED
      1 x Jack Herer 3 Auto - Coco
      3 x Mexican Airlines Auto - Fast Buds - Coco
      1 x G13 - Seed King - Coco
      1 x Gelato (Bonsai Mom) - Clone - Coco
      1 x Bubba Cheese Auto - HBS - Coco

      Veg Tent:
      300W COBB LED
      Empty

      First Grow Journal and Clone Journal
      https://forum.growweedeasy.com/forum...needed-a-hobby

      Strawberry Banana, Gelato & Jack Herer Auto Grow Journal
      https://forum.growweedeasy.com/forum...a-x2-gelato-x1

      All Auto's Journal
      https://forum.growweedeasy.com/forum...auto-s-journal

      Gelato Bonsai Mother Project
      https://forum.growweedeasy.com/forum...onsai-mom-grow

      Comment


        #6
        50w/ sq. ft. for HID’s is a good general reference but it’s deceiving. I have a buddy that runs a 600w in his 4x4 tent and he gets great results. It’s not surprising as it’s a fairly common setup. That 600w in the 16 sq. ft. tent has him at the same 37.5w per sq. ft. that you get in a 2x4 with 2-150w. The higher intensity 600w gives better penetration which leads to better results even though the watts per square foot are the same.
        Failure is an opportunity for improvement!!

        Comment


        • TheGoodFarmer
          TheGoodFarmer commented
          Editing a comment
          Yeah, I have had a feeling that I wasn't getting good canopy penetration with such small lights, Buds don't grow for shit on the bottom. also, I have also noticed that I lose a lot of the bottom canopy very quickly even before flower stretch is completely over. My best guess is its cause I am moving the light further up away from the bottom. Its funny cause when I bought these lights the shop owner insisted I use HPS cause of its ability to penetrate. Another thing I hate is having to keep the lights closer to the plants its causes heat issues at the top colas some days. So If I were to keep using them should I just learn how to train the plants to grow short or try pruning them

        • Obi-Wan
          Obi-Wan commented
          Editing a comment
          I’d try to train them to be smaller and wider. If they stretch a little more than you expect you’ll have a pretty good idea if you need to lollipop by week 3-4 of flower.

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